Document ENABLE_ASSERTIONS=1


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/MakefileGuide.html b/docs/MakefileGuide.html
index f1c546c..254f21c 100644
--- a/docs/MakefileGuide.html
+++ b/docs/MakefileGuide.html
@@ -632,6 +632,10 @@
     to the compilers and linkers to ensure that profile data can be collected
     from the tools built. Use the <tt>gprof</tt> tool to analyze the output from
     the profiled tools (<tt>gmon.out</tt>).</dd>
+    <dt><a name="ENABLE_ASSERTIONS"><tt>ENABLE_ASSERTIONS</tt></a></dt>
+    <dd>If set to any value, causes the build to enable assertions, even if 
+    building a release or profile build.  This is slower than a release build but
+    far faster than a debug build.</dd>
     <dt><a name="EXPERIMENTAL_DIRS"><tt>EXPERIMENTAL_DIRS</tt></a></dt>
     <dd>Specify a set of directories that should be built, but if they fail, it
     should not cause the build to fail. Note that this should only be used